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	<head>
		<meta charset="UTF-8" />
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		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
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	<body>
		<script>
			// forEach() 遍历数组
			let arr = [1, 2, 3];
			let sum = 0;
			arr.forEach(function (value, index, array) {
				console.log('每个数组元素' + value);
				console.log('每个数组元素的索引号' + index);
				console.log('数组本身' + array);

				sum += value;
			});
			console.log(sum);
		</script>
	</body>
</html>
